Manga Wasteful Days of High School Girl

Once a boredom Tanaka decided to give to the schoolmates the nicknames based on their whims. Her friend Sakuti became Ota for her botanical interests, and other her friend Saginomiya became Robo. In revenge her friends decided to call Tanaka of "tank". These are foolish days of 3 friends from senior average educational institutions, approving (or not approving) the vison level youth.